question regarding header & tuned pipe

Tue Mar 25 12:20:15 AKST 2003

The Bolly pipes/mufflers also make for good ballast if you hoping to
increase the weight of your plane.  The ES, Greve, Asano, will save you
ounces over a Bolly.  Having tried the 480, 590, 565 Bolly mufflers, ES
2C140 pipe, Greve, and some home-made multi chamber pipes, the Bollys have
always been the lowest in power output.  The Bollys do sound quiet, but that
also may be due to the decrease in performance.  The Bolly 565 is a
rectangular muffler that outperformed the 480 and 590, but weighs over 6.0
oz.  

Jim W.

-----Original Message-----
From: Tomanek, Wojtek [mailto:tomanekw at saic-abingdon.com] 
Sent: Tuesday, March 25, 2003 1:08 PM
To: 'discussion at nsrca.org'
Subject: RE: question regarding header & tuned pipe

Ron

I have been using Bolly FS-140 Four Stroke 1.40 Muffler for two season now,
it is very quiet, it holds the temperature well and it has an aluminum neck
at the intake that fits great with 1/2 in Teflon header coupler.

Wojtek

-----Original Message-----
From: s.vannostrand at kodak.com [mailto:s.vannostrand at kodak.com]
Sent: Tuesday, March 25, 2003 1:47 PM
To: discussion at nsrca.org
Subject: Re: question regarding header & tuned pipe

Bolly mufflers use a very different kind of resin that is more temp
resistent than the ES pipes.  It will become brittle over time, but will not
ablate.  Bolly's also eventually leak like a seive over their length
eventually. 

--Lance 

Ron Lockhart <ronlock at comcast.net> 
Sent by: discussion-request at nsrca.org 

03/25/2003 10:11 AM 
Please respond to discussion 

        To:        discussion at nsrca.org 
        cc:         
        Subject:        Re: question regarding header & tuned pipe

Lance,

Would you know, is the end of the pipe being exposed to exhaust 
gas a concern with the Bolly pipes & mufflers?

TIA   Ron Lockhart

----- Original Message -----
From: s.vannostrand at kodak.com
Date: Tuesday, March 25, 2003 10:52 am
Subject: Re: question regarding header & tuned pipe

> Every change in backpressure, due to the expansion chamber or 
> header change will cause a wave reflection, however, the effects of 
> necking down from 7/8 to the approx 3/4" OS pipe will not be much.  
The bigger problem is that if the pipe is composite (CF) you will 
ablate the pipe input and ruin the pipe.  I've seen 3 of these for 
repair.  The hot exhaust gasses can not be allowed to contact the end 
of the fibers and resin for most resins.  ES pipes fail in this 
fashion.  Some people have been successful in using a squishy coupler 
(like the Macs grey) but this is not a reliable setup for most people. 
> 
> The Mintor carbon fiber pipe (I have a N.I B. one for sale for 
> $160 including shipping) uses an aluminum inlet to prevent this.  I 
> also have a Macs to OS adapter made from aluminum for $12.
> 
> -Lance

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